You don't catch the theme until you beat the game unfortunately... The trick to the part you were stuck at was to go through the room to your right up through it and out to a ledge and jump down between the wires onto the platform you were trying to reach. You were close to the end too, However, there's a trick to beating the boss. It depends on how you handle the enemies. did you use stealth? or did you follow trust the game and "LEAVE NOTHING ALIVE"? Remember, the game is a liar ;) and also there are 2 ways to beat the boss, and for the true ending check the boss room ;) OK, no more hints!